Publisher: Chemical Society of Nigeria

Effect of Combustion Temperature and Time On Ash Yields of Rice Husks

C. D. Igwebike- Ossi, J. A. Ibemesi
KEYWORDS: rice husk, rice husk ash, silica, combustion, incineration

ABSTRACT:

Rice  husk  ash  (RHA)  samples  were  obtained  by  combustion  of  rice  husks  (RH)  in  a  muffle  furnace  at varied  temperatures  of  400  to  10000C  and  combustion  duration  of  one  to  six  hours.  The  RHA  yields obtained  at  the  specified  incineration  conditions  were  found  to  be  in  the  range  of  19  to  24%.  Plots  of  ash yields  versus  time  indicated  that  lower  combustion  temperatures  (400,  500  and  6000C)  gave  higher  ash yields  than  higher  temperatures  (700  to  10000C).  The  ash  yields,  however  did  not  vary  significantly  with prolonged  combustion  time  (5  –  6hrs)  at  both  lower  and  higher  temperatures,  showing  a  greater dependence of higher ash yields on the temperature of incineration than on the duration.


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